I keep seeing things for "all day computing" out of mobile devices, people not happy with even the 6-8 hours out of some of the netbooks. I do really think we'll need something in line with how most MP3 players are, where it is somewhere like 24 hours use. Issue is, technology isn't to the point where we can really do that, and have the power to do what they want. It is doable with single use devices, but not general purpose, unless you want a big battery. I don't think people will want to have a battery as big as the rest of the device.
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